[libcxx-commits] [libcxx] [libc++] Introduce _LIBCPP_COMPRESSED_ELEMENT (PR #134253)

[Louis Dionne via libcxx-commits]

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@@ -89,5 +90,9 @@ ABI Affecting Changes
   ``_LIBCPP_ABI_NO_ITERATOR_BASES``. If you are using this flag and care about ABI stability, you should set
   ``_LIBCPP_ABI_NO_REVERSE_ITERATOR_SECOND_MEMBER`` as well.
 
+- The internal types ``__map_value_compare``, ``__tuple_leaf``, ``__unordered_map_hasher``, ``__unordered_map_equal``,
+  ``__hash_map_hasher`` and ``__hash_map_equal`` have been refactored to use ``_LIBCPP_COMPRESSED_ELEMENT`` instead of
+  potentially inheriting from the types they wrap. At this point in time we are not aware of any ABI breaks this causes.
----------------
ldionne wrote:

```suggestion
  potentially inheriting from the types they wrap. At this point in time we are not aware of any ABI changes caused by this.
```

https://github.com/llvm/llvm-project/pull/134253